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(SpamLover) wrote in message . com...
Just out of curiosity - Did anyone ever try a cabinet-sized or room-sized cavity resonator as roof filter in a HF receiving system? I've trawled a bit for construction details, and found that a squat cylindrical resonator may have a radius of a quarter wave, so say... Hi Filippo, some experience is described by Harry SM0VPO at http://w1.859.telia.com/~u85920178/use/cavity.htm He worked from 28 to 1300 MHz. The biggest object he used was an old galvanised dustbin. BR from Ivan |